/**
 *    Copyright ${license.git.copyrightYears} the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.generator.internal.util;

import java.util.StringTokenizer;

/**
 * 
 * @author Jeff Butler
 */
public class StringUtility {

  /**
   * Utility class. No instances allowed
   */
  private StringUtility() {
    super();
  }

  public static boolean stringHasValue(String s) {
    return s != null && s.length() > 0;
  }

  public static String composeFullyQualifiedTableName(String catalog, String schema, String tableName, char separator) {
    StringBuilder sb = new StringBuilder();

    if (stringHasValue(catalog)) {
      sb.append(catalog);
      sb.append(separator);
    }

    if (stringHasValue(schema)) {
      sb.append(schema);
      sb.append(separator);
    } else {
      if (sb.length() > 0) {
        sb.append(separator);
      }
    }

    sb.append(tableName);

    return sb.toString();
  }

  public static boolean stringContainsSpace(String s) {
    return s != null && s.indexOf(' ') != -1;
  }

  public static String escapeStringForJava(String s) {
    StringTokenizer st = new StringTokenizer(s, "\"", true); //$NON-NLS-1$
    StringBuilder sb = new StringBuilder();
    while (st.hasMoreTokens()) {
      String token = st.nextToken();
      if ("\"".equals(token)) { //$NON-NLS-1$
        sb.append("\\\""); //$NON-NLS-1$
      } else {
        sb.append(token);
      }
    }

    return sb.toString();
  }

  public static String escapeStringForXml(String s) {
    StringTokenizer st = new StringTokenizer(s, "\"", true); //$NON-NLS-1$
    StringBuilder sb = new StringBuilder();
    while (st.hasMoreTokens()) {
      String token = st.nextToken();
      if ("\"".equals(token)) { //$NON-NLS-1$
        sb.append("&quot;"); //$NON-NLS-1$
      } else {
        sb.append(token);
      }
    }

    return sb.toString();
  }

  public static boolean isTrue(String s) {
    return "true".equalsIgnoreCase(s); //$NON-NLS-1$
  }

  public static boolean stringContainsSQLWildcard(String s) {
    if (s == null) {
      return false;
    }

    return s.indexOf('%') != -1 || s.indexOf('_') != -1;
  }
}
